From: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
To: dev@dpdk.org, honnappa.nagarahalli@arm.com, alialnu@mellanox.com,
orgerlitz@mellanox.com, wenzhuo.lu@intel.com,
beilei.xing@intel.com, bernard.iremonger@intel.com,
ferruh.yigit@intel.com
Cc: hemant.agrawal@nxp.com, jerinj@marvell.com,
viacheslavo@mellanox.com, thomas@monjalon.net,
ruifeng.wang@arm.com, phil.yang@arm.com, nd@arm.com,
zhihong.wang@intel.com, stable@dpdk.org
Subject: [dpdk-dev] [PATCH v3 1/3] app/testpmd: clock gettime call in throughput calculation
Date: Mon, 6 Jul 2020 18:32:29 -0500 [thread overview]
Message-ID: <20200706233231.25881-1-honnappa.nagarahalli@arm.com> (raw)
In-Reply-To: <20200617144307.9961-1-honnappa.nagarahalli@arm.com>
The throughput calculation requires a counter that measures
passing of time. However, the kernel saves and restores the PMU
state when a thread is unscheduled and scheduled. This ensures
that the PMU cycles are not counted towards a thread that is
not scheduled. Hence, when RTE_ARM_EAL_RDTSC_USE_PMU is enabled,
the PMU cycles do not represent the passing of time.
This results in incorrect calculation of throughput numbers.
Use clock_gettime system call to calculate the time passed since
last call.
Bugzilla ID: 450
Fixes: 0e106980301d ("app/testpmd: show throughput in port stats")
Cc: zhihong.wang@intel.com
Cc: stable@dpdk.org
Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>
Tested-by: Phil Yang <phil.yang@arm.com>
Tested-by: Ali Alnubani <alialnu@mellanox.com>
---
v3:
1) Dropped 'noisy vnf' patch, will add with future Dharmik's patch
2) Dropped flow gen patch, send out a separate one if there is
consensus on the mailing list
3) Changed the logic to display burst stats to make it easier
to understand (Ferruh)
v2: Updated commit log in 1/5 (Jerin)
app/test-pmd/config.c | 44 +++++++++++++++++++++++++++++--------------
1 file changed, 30 insertions(+), 14 deletions(-)
diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 016bcb09c..91fbf99f8 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -54,6 +54,14 @@
#define ETHDEV_FWVERS_LEN 32
+#ifdef CLOCK_MONOTONIC_RAW /* Defined in glibc bits/time.h */
+#define CLOCK_TYPE_ID CLOCK_MONOTONIC_RAW
+#else
+#define CLOCK_TYPE_ID CLOCK_MONOTONIC
+#endif
+
+#define NS_PER_SEC 1E9
+
static char *flowtype_to_str(uint16_t flow_type);
static const struct {
@@ -136,9 +144,10 @@ nic_stats_display(portid_t port_id)
static uint64_t prev_pkts_tx[RTE_MAX_ETHPORTS];
static uint64_t prev_bytes_rx[RTE_MAX_ETHPORTS];
static uint64_t prev_bytes_tx[RTE_MAX_ETHPORTS];
- static uint64_t prev_cycles[RTE_MAX_ETHPORTS];
+ static uint64_t prev_ns[RTE_MAX_ETHPORTS];
+ struct timespec cur_time;
uint64_t diff_pkts_rx, diff_pkts_tx, diff_bytes_rx, diff_bytes_tx,
- diff_cycles;
+ diff_ns;
uint64_t mpps_rx, mpps_tx, mbps_rx, mbps_tx;
struct rte_eth_stats stats;
struct rte_port *port = &ports[port_id];
@@ -195,10 +204,17 @@ nic_stats_display(portid_t port_id)
}
}
- diff_cycles = prev_cycles[port_id];
- prev_cycles[port_id] = rte_rdtsc();
- if (diff_cycles > 0)
- diff_cycles = prev_cycles[port_id] - diff_cycles;
+ diff_ns = 0;
+ if (clock_gettime(CLOCK_TYPE_ID, &cur_time) == 0) {
+ uint64_t ns;
+
+ ns = cur_time.tv_sec * NS_PER_SEC;
+ ns += cur_time.tv_nsec;
+
+ if (prev_ns[port_id] != 0)
+ diff_ns = ns - prev_ns[port_id];
+ prev_ns[port_id] = ns;
+ }
diff_pkts_rx = (stats.ipackets > prev_pkts_rx[port_id]) ?
(stats.ipackets - prev_pkts_rx[port_id]) : 0;
@@ -206,10 +222,10 @@ nic_stats_display(portid_t port_id)
(stats.opackets - prev_pkts_tx[port_id]) : 0;
prev_pkts_rx[port_id] = stats.ipackets;
prev_pkts_tx[port_id] = stats.opackets;
- mpps_rx = diff_cycles > 0 ?
- diff_pkts_rx * rte_get_tsc_hz() / diff_cycles : 0;
- mpps_tx = diff_cycles > 0 ?
- diff_pkts_tx * rte_get_tsc_hz() / diff_cycles : 0;
+ mpps_rx = diff_ns > 0 ?
+ (double)diff_pkts_rx / diff_ns * NS_PER_SEC : 0;
+ mpps_tx = diff_ns > 0 ?
+ (double)diff_pkts_tx / diff_ns * NS_PER_SEC : 0;
diff_bytes_rx = (stats.ibytes > prev_bytes_rx[port_id]) ?
(stats.ibytes - prev_bytes_rx[port_id]) : 0;
@@ -217,10 +233,10 @@ nic_stats_display(portid_t port_id)
(stats.obytes - prev_bytes_tx[port_id]) : 0;
prev_bytes_rx[port_id] = stats.ibytes;
prev_bytes_tx[port_id] = stats.obytes;
- mbps_rx = diff_cycles > 0 ?
- diff_bytes_rx * rte_get_tsc_hz() / diff_cycles : 0;
- mbps_tx = diff_cycles > 0 ?
- diff_bytes_tx * rte_get_tsc_hz() / diff_cycles : 0;
+ mbps_rx = diff_ns > 0 ?
+ (double)diff_bytes_rx / diff_ns * NS_PER_SEC : 0;
+ mbps_tx = diff_ns > 0 ?
+ (double)diff_bytes_tx / diff_ns * NS_PER_SEC : 0;
printf("\n Throughput (since last show)\n");
printf(" Rx-pps: %12"PRIu64" Rx-bps: %12"PRIu64"\n Tx-pps: %12"
--
2.17.1
next prev parent reply other threads:[~2020-07-06 23:32 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-17 14:43 [dpdk-dev] [PATCH 1/5] " Honnappa Nagarahalli
2020-06-17 14:43 ` [dpdk-dev] [PATCH 2/5] app/testpmd: enable burst stats for flowgen mode rx path Honnappa Nagarahalli
2020-06-18 14:57 ` Phil Yang
2020-06-17 14:43 ` [dpdk-dev] [PATCH 3/5] app/testpmd: enable burst stats for noisy vnf mode Honnappa Nagarahalli
2020-06-18 7:16 ` Jens Freimann
2020-06-17 14:43 ` [dpdk-dev] [PATCH 4/5] app/testpmd: fix burst percentage calculation Honnappa Nagarahalli
2020-06-18 15:01 ` Phil Yang
2020-06-23 13:33 ` Ali Alnubani
2020-06-17 14:43 ` [dpdk-dev] [PATCH 5/5] app/testpmd: enable empty polls in burst stats Honnappa Nagarahalli
2020-06-18 15:05 ` Phil Yang
2020-06-23 13:34 ` Ali Alnubani
2020-06-17 15:16 ` [dpdk-dev] [PATCH 1/5] app/testpmd: clock gettime call in throughput calculation Jerin Jacob
2020-06-18 4:03 ` Honnappa Nagarahalli
2020-06-18 10:16 ` Jerin Jacob
2020-06-18 15:08 ` Phil Yang
2020-06-23 13:33 ` Ali Alnubani
2020-06-26 22:09 ` [dpdk-dev] [PATCH v2 " Honnappa Nagarahalli
2020-06-26 22:09 ` [dpdk-dev] [PATCH v2 2/5] app/testpmd: enable burst stats for flowgen mode rx path Honnappa Nagarahalli
2020-07-06 16:02 ` Ferruh Yigit
2020-07-06 17:06 ` Honnappa Nagarahalli
2020-07-06 17:17 ` Ferruh Yigit
2020-07-06 18:46 ` Honnappa Nagarahalli
2020-06-26 22:09 ` [dpdk-dev] [PATCH v2 3/5] app/testpmd: enable burst stats for noisy vnf mode Honnappa Nagarahalli
2020-07-06 16:08 ` Ferruh Yigit
2020-07-06 16:59 ` Honnappa Nagarahalli
2020-07-06 17:11 ` Ferruh Yigit
2020-07-06 17:41 ` Honnappa Nagarahalli
2020-06-26 22:09 ` [dpdk-dev] [PATCH v2 4/5] app/testpmd: fix burst percentage calculation Honnappa Nagarahalli
2020-07-06 16:10 ` Ferruh Yigit
2020-06-26 22:09 ` [dpdk-dev] [PATCH v2 5/5] app/testpmd: enable empty polls in burst stats Honnappa Nagarahalli
2020-07-06 17:05 ` Ferruh Yigit
2020-07-06 19:11 ` Honnappa Nagarahalli
2020-07-07 9:32 ` Ferruh Yigit
2020-07-06 15:36 ` [dpdk-dev] [PATCH v2 1/5] app/testpmd: clock gettime call in throughput calculation Ferruh Yigit
2020-07-06 16:53 ` Honnappa Nagarahalli
2020-07-06 17:19 ` Ferruh Yigit
2020-07-06 23:32 ` Honnappa Nagarahalli [this message]
2020-07-06 23:32 ` [dpdk-dev] [PATCH v3 2/3] app/testpmd: fix burst percentage calculation Honnappa Nagarahalli
2020-07-06 23:32 ` [dpdk-dev] [PATCH v3 3/3] app/testpmd: enable empty polls in burst stats Honnappa Nagarahalli
2020-07-07 17:47 ` [dpdk-dev] [PATCH v3 1/3] app/testpmd: clock gettime call in throughput calculation Ferruh Yigit
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